Improving heat ageing and thermal properties of silicone rubber using montmorillonite clay |
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| Authors: | Nik Intan Nik Ismail M Ali Ansarifar Mo Song |
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| Affiliation: | 1. Materials Department, Loughborough University, Leicestershire, United Kingdom;2. Centres of Excellence, Advanced Processing and Product Technology Centre, Malaysian Rubber Board, Sungai Buloh, Selangor, Malaysia |
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| Abstract: | Heat ageing and thermal stability of a silicone rubber (SR) filled with montmorillonite clay (MMT) was investigated. Three types of rubber nanocomposites were prepared with highly exfoliated Cloisite 30B (SR/C30B), intercalated/exfoliated Cloisite Na+ (SR/Na+MMT), and highly intercalated Cloisite 20A (SR/C20A). This study showed that the SR/C30B nanocomposite exhibited excellent heat resistance in comparison to the other two nanocomposites and neat SR as revealed by higher retention strength. The thermal stability of the rubber in air was strongly dependent on the clay morphology and increased in the following order: highly intercalated/exfoliated SR/Na+MMT < highly intercalated SR/C20A < highly exfoliated SR/C30B. The thermogravimetric analyses of the SR/C30B nanocomposite showed a substantial increase in the final residue in comparison with the neat SR. This indicated a major improvement in the thermal stability of the rubber containing the exfoliated clay, which was also supported by the higher activation energy of decomposition measured for the nanocomposite. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 41061. |
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| Keywords: | ageing clay degradation rubber thermogravimetric analysis (TGA) |
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